NDLI: Effect of molecular weight on conformational changes of PEO: an infrared spectroscopic analysis

Content Provider	Springer Nature Link
Author	Yang, Shuyan Liu, Zhimeng Liu, Yuping Jiao, Yuanqi
Copyright Year	2014
Abstract	Effect of molecular weight on conformation, helix structure (H structure) and trans planar structure (T structure), of Poly(ethylene oxide) (PEO) has been investigated in detail by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and differential scanning calorimeter. Two main diffraction peaks at about 2θ = 19° and 23° are discovered, and XRD patterns reveal that the unit cell of crystalline PEO belongs to the monoclinic lattice. The crystallinity decreases from 93.82 to 59.62 %, and the deviation of crystalline temperature of PEO-0.5 is larger than those of the other three under four reheated cycles. From FTIR results, a red shift about 11 cm$^{−1}$ is observed in the stretching vibration of –C–O–C– with increasing molecular weight, suggesting the presence of chain–chain interactions to restrict the stretching vibration of -C–O–C– in main chains. Meanwhile, the bending region of –C–C–O– at about 533 cm$^{−1}$ sensitive to tension shifts to lower wavenumber, and a new peak at about 510 cm$^{−1}$ emerges with increasing molecular weight, which is the indicator of internal tension/strain and orientation. Furthermore, the peak intensity ratios of H structure decrease with increasing molecular weight. In contrast, T structure increases dramatically. Consequently, with respect to molecular weight, the possible interactions, entanglements and tie molecules, of PEO molecular chains to explain the difference between H and T structure is proposed, which is in agreement with the experimental observations quite well.
Starting Page	1544
Ending Page	1552
Page Count	9
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	50
Issue Number	4
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2014-11-21
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Materials Science Characterization and Evaluation of Materials Polymer Sciences Continuum Mechanics and Mechanics of Materials Crystallography Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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